SLLSFX3B October   2024  – June 2026 TCAN844-Q1

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1  Absolute Maximum Ratings
    2. 5.2  ESD Ratings
    3. 5.3  ESD Ratings, IEC Specification
    4. 5.4  Recommended Operating Conditions
    5. 5.5  Thermal Characteristics
    6. 5.6  Power Supply Characteristics
    7. 5.7  Dissipation Ratings
    8. 5.8  Electrical Characteristics
    9. 5.9  Switching Characteristics
    10. 5.10 Typical Characteristics
  7. 6 Parameter Measurement Information
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Pin Description
        1. 7.3.1.1 TXD
        2. 7.3.1.2 GND
        3. 7.3.1.3 VCC
        4. 7.3.1.4 RXD
        5. 7.3.1.5 VIO
        6. 7.3.1.6 CANH and CANL
        7. 7.3.1.7 STB (Standby)
      2. 7.3.2 CAN Bus States
      3. 7.3.3 TXD Dominant Timeout (DTO)
      4. 7.3.4 CAN Bus Short-Circuit Current Limiting
      5. 7.3.5 Thermal Shutdown (TSD)
      6. 7.3.6 Undervoltage Lockout
      7. 7.3.7 Unpowered Device
      8. 7.3.8 Floating pins
    4. 7.4 Device Functional Modes
      1. 7.4.1 Operating Modes
      2. 7.4.2 Normal Mode
      3. 7.4.3 Standby Mode
        1. 7.4.3.1 Remote Wake Request via Wake-Up Pattern (WUP) in Standby Mode
      4. 7.4.4 Driver and Receiver Function
  9. 8 Application Information Disclaimer
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
        1. 8.2.1.1 CAN Termination
      2. 8.2.2 Detailed Design Procedures
        1. 8.2.2.1 Bus Loading, Length and Number of Nodes
      3. 8.2.3 Application Curve
    3. 8.3 System Examples
    4. 8.4 Power Supply Recommendations
    5. 8.5 Layout
      1. 8.5.1 Layout Guidelines
      2. 8.5.2 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 Receiving Notification of Documentation Updates
    2. 9.2 Support Resources
    3. 9.3 Trademarks
    4. 9.4 Electrostatic Discharge Caution
    5. 9.5 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information

7.4.4 Driver and Receiver Function

The TCAN844-Q1 logic I/Os support CMOS levels with respect to either VCC for 5V systems (TCAN844-Q1) or VIO for compatibility with MCUs that support 3.3V or 5V systems (TCAN844V-Q1).

Table 7-5 Driver Function Table
Device ModeTXD Input2Bus OutputsDriven Bus State(2)
CANHCANL
NormalLowHighLowDominant
High or openHigh impedanceHigh impedanceBiased recessive
StandbyXHigh impedanceHigh impedanceBiased to ground
(1) X = irrelevant
(2) For bus state and bias see Figure 7-2 and Figure 7-3
Table 7-6 Receiver Function Table Normal and Standby Mode
Device ModeCAN Differential Inputs VID = VCANH – VCANLBus StateRXD Pin
NormalVID ≥ 0.9VDominantLow
0.5V < VID < 0.9VUndefinedUndefined

VID ≤ 0.5V

RecessiveHigh
StandbyVID ≥ 1.15VDominantHigh
Low if a remote wake event occurred
See Figure 7-5
0.4V < VID < 1.15VUndefined
VID ≤ 0.4VRecessive
AnyOpen (VID ≈ 0V)OpenHigh